a = 5				  # 将数字5赋给变量a
b = 3 + 5			  # 将表达式3+5的运算结果8赋给变量b
c = a				  # 将变量a的值赋给变量c

c = 10				  # 将变量c的值修改为10
c = 11				  # 将变量c的值再次修改为11

a = b = c = d = 20
d = 20
c = d
b = c
a = b

a, b, c, d = 0, 1, 2, 3
a = 0
b = 1
c = 2
d = 3

a, b, c, d = 0, 1, 2, e

print(a)

PI = 3.1415926
CIRCLE_R = 10